Sudoku Puzzles Book, Hard and Extremely Difficult Games for Evil Genius: 100 Puzzles (1 Puzzle per page), Sudoku Books with Two Level, Brain Training

Sudoku Puzzles Book, Hard and Extremely Difficult Games for Evil Genius can tune up your brain and enhance your memory by playing Sudoku consistently.
Sudoku empowers your psyche, builds focus and fulfills you feel by giving you a feeling of achievement. It is said it can likewise diminish the shot of creating Alzheimer.
This volume features of:
- 50 Hard Sudoku Level
- 50 Extremely Hard Sudoku Level
with Solution to check your answer.
There is 1 puzzle per page so that you can jot down figure to calculate before input the number inside.
Enjoy